The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 01, 2008
Filed:
Mar. 02, 2004
Rimon Ikeno, Ibaraki, JP;
Rimon Ikeno, Ibaraki, JP;
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A carry look-ahead circuit for an adder to decrease circuit size and power consumption. The carry look-ahead circuit is composed of 2-input NAND gates, 2-input NOR gate, AND-NOR type composite gates, OR-NAND type composite gate, or other gates with 2 or less series stages of transistors inserted between the output terminal and the power source line or the ground line. When the number of series stages of transistors increases, the driving power decreases. Consequently, in order to maintain the same operation speed, it is necessary to increase the transistor size. The use of multi-input NAND gates and NOR gates, makes it possible to suppress the number of series stages of transistors and to reduce the transistor size. As a result, it is possible to decrease the circuit size and power consumption.